A METHOD FOR THE PRODUCTION OF HOPOLYMER COARSE-DISPERSION POLYVINYL ACETATE DISPERSION
A method for the production of homopolymer coarse-dispersion polyvinyl acetate dispersion by emulsion polymerization of vinyl acetate in the acid medium involves preparation of the aqueous phase by mixing the aqueous solution of polyvinyl alcohol, demineralized water, formic acid and ferrous iron su...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A method for the production of homopolymer coarse-dispersion polyvinyl acetate dispersion by emulsion polymerization of vinyl acetate in the acid medium involves preparation of the aqueous phase by mixing the aqueous solution of polyvinyl alcohol, demineralized water, formic acid and ferrous iron sulfate, subsequent mixing the obtained aqueous phase, hydrogen peroxide and vinyl acetate, polymerization of the obtained mixture in the cascade of at least two reactors, cooling, neutralization of the obtained dispersion with neutralizing agent to aì being equal to 4.5-6, and plastification. As neutralizing agent hydroxide or oxide of alkaline metal, e.g. of barium or ruthenium or strontium are used. |
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